156 



CHELONIA. 



Tropidemys valanginensis (Pictet l ) indicates the survival of the 

 genus to the Neocomian. In . a species from the Kimeridgian of 

 Hanover, referred to this genus and figured by Portis 2 , it appears 

 that there was a median line of small intervertebral shields. 



Pig. 38. 



Tropidemys (cf.) langi.—The second neural bone ; from the 

 Kimeridge Clay of Dorsetshire. J. 



Tropidemys langi, Eiitimeyer 3 . 



The type species. Carapace very broad and flat anteriorly. Ver- 

 tebral shields with highly curved anterior and posterior borders. 



The following specimens are provisionally referred to this species, 

 but there is no evidence to show that they may not be referable to 

 T. expansa, Eiit. 4 , or T. gibba, Put. 5 



Hab. Europe (Switzerland, and ? England). 



44178 b. The second neural bone of the carapace; from the Kime- 

 (Fig.) ridge Clay (Upper Jurassic) of Weymouth, Dorsetshire. 

 This specimen (fig. 38) indicates a smaller individual than 

 the type specimen, of which the 3rd to the 6th neurals 

 are figured by Eiitimeyer in the ; N. Denkschr. schw. Ges. 

 Nat. ' vol. xxv. art. 2, pi. vii. fig. 2 ; it agrees in contour 

 with the 2nd neural of T. expansa figured in pi. ix. fig. 3 

 of the same. Purchased, 1873. 



45920. The first three costals of the right side of a young carapace, 

 not improbably specifically identical with the preceding 

 specimen ; from the Kimeridge Clay of Weymouth. The 

 subequal facets for the two lateral surfaces of both the 

 2nd and 3rd neurals are distinctly shown. The specimen 

 accords well with the larger example of T. expansa figured 

 by Eiitimeyer, op. cit. pi. ix. fig, 3. The contour of por- 

 tions of the first three vertebral shields is preserved. 



Purchased, 1874. 



1 Materiaux pour la Paleontologie Suisse, ser. 2. — Terrain Cretacede Ste.- 

 Croix, p. 30, pi. i. (1858-60). 



2 Palacontographica, vol. xxv. art. 3, pi. xv. (1878). 



3 N. Denkschr. schw. Ges. vol. xxv. art. 2, p. 28 (1873). 



4 hoc. cit. 5 Loc, cit. 



